# -*-coding=utf-8 -*-
def mul(a, b):
	c = a*b
	print 'c:',c

# 设置默认参数
def car_sale(price, brand,  color='yellow'):
	print 'price:', price, 'color:', color, 'brand:', brand

mul(2,3)
car_sale(1000, 'Audi')
	